An action potential has two phases. In the first phase, the inside of the cell becomes more positive. In the second phase, the inside of the cell becomes more negative. The first phase is caused by ______ and the second phase is caused by ________ Group of answer choices Na+ moving into cell.... K+ moving out of cell Na+ moving out of cell... K+ moving into cell K+ moving into cell.... Na+ moving out of cell K+ moving out of cell... Na+ moving into cell
Added by Elijah M.
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This is caused by the rapid influx of Na+ (sodium ions) moving into the cell through voltage-gated sodium channels. Show more…
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The action potential is a transient change in the resting membrane potential from -70 mV to +30 mV, then back to -70 mV. This change is caused by the opening of first _ then voltage-gated channels. Na+ then K+ What area(s) of the neuron first generate signals that open the voltage-gated channels in the first part of the axon? The axon hillock, Axon collaterals, Dendrites and cell body. As the axon hillock depolarizes, Voltage-gated Na+ channels open and Na+ moves (into or out of) the cell causing further (depolarization or repolarization). out of; depolarization into; repolarization out of; repolarization into; depolarization If depolarization reaches -55 mV, an action potential will be generated. What is this -55 mV trigger point called? Threshold At the end of the depolarization phase, what voltage-gated channels open to help restore the resting membrane potential? Voltage-gated K+ channels. Repolarization is caused by the movement of what ion (sodium or potassium), in what direction (into or out of the cell)? potassium; out of the cell sodium; into the cell After an action potential, the membrane becomes more negative than -70 mV. This period is called hyperpolarization.
Sri K.
Which of the following is true about the depolarization phase of the action potential (select all that apply): Select all that apply - It is due to Na+ coming into the cell through voltage-gated Na+ channels. - The cell is getting more positive. - The depolarization phase of the action potential begins at -70 mV. Which of the following are TRUE about the voltage-gated Na+ channels described in the video (select all that apply): Select all that apply - They open when the cell becomes more positive. - These channels are closed during the repolarization phase. - These channels are open during the hyperpolarization phase. The inactivation gate closes when the membrane potential reaches +30 mV.
Madhur L.
An action potential involves Na+ moving ________ the cell and K+ moving ________ the cell. a. inside; outside b. outside; inside c. inside; inside d. outside; outside
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